Gas-cleaning apparatus



Sept. 2,l 1930. J. H. LAWRENCE 1,774,604

GAS CLEANING APPARATUS Filed March 27, 1925 Snom/woz Patented Sept. 2, 1930 UNITED STATES 1 JOHN H. LAWRENCE, OF

PATENT OFFICE EW YORK, N. Y., ASSIGNOR, BY 'MESNE ASSIGNMENTS, TO.

METROPOLITAN ENGIN ING CORPORATION, OF NEW YORK, N. Y., A. CORPORA- TION OF NEW YORK eas-CLEANING APPARATUS' Application led March 27, 1925. Serial No. `18,708.

is illustrated at l with a flue 2 for carrying o the gases.- From this flue the'gases pass to a wet cinder catcher of known type. In the path of the gases there is a baille 3 (or there ma be a plurality of such baffles) which deflects t e gases down on to the surface of a bod of water 4 in a tank 5 extending across the ottom of the casing 6. The chamber 6 is widened in the vertical direction at its outlet and leads to an electric dust precipitator, also of a known type.

V Within the casing 7 of this precipitator are -bars 8 suspended at their ends from insulators 9 and supporting at their upper ends vertical rods 10 constituting electrodes which are charged with electricity by any usual or suitable apparatus. From the casing 7 of the electric dust precipitator the clean gases pass out to a stack 11. The electrodes are shaken at intervals so as to cause the dust to drop into a pan 12 below the casing from which they are removed from time to time.

The 'cinders and coarser particles of dust are caught in the wet apparatus, and the finer particles in the electric apparatus. I propose to proportion these two apparatus so that from 7 5% to 95% of the work is done in the wet apparatus. But for cleaning other gases, or for cleaning the gases from the iues of other designs of boiler, the two cleaning apparatus may be differently proportioned.

The wet cinder catcher 1s not adapted to remove fine particles of dust eiciently, these being carried by the current of gases past the water trap without beincg caught. An electric precipitator alone for oing about the same amount of work would require very much more space than is occupied by the combinaa furnace. Such gases are normally very dry,

so as to be poorly adapted to electric precipitation. The passage through the wet apparatus serves vto condition the gases by the addition of moisture, which increases the efciency of the electric apparatus. In the use of such electric apparatus alone in fact, I have found that the eiiiciency is increased if I condition the gases by injecting steam thereinto-in advance of the precipitator.

Though I havedescribed with great particularity of detail a certain embodiment of my invention, yet it is not to be understood therefrom that the invention is restricted to the particular apparatus illustrated. Various modifications thereof may be made by those skilled in the art without departing r from the invention as dened in the following claims.

What I claim is 1. A cleaning apparatus for furnace gases comprising a passage for said Gases, a water container in'said passage, a baiiie to direct gases in said passage against the surface flue ` of said water to collect and quench cinders and the larger particles suspended in the the surface of said water to collect and quench cinders and the lar er particles suspended in the gases passing t rough said passage, and an electric dust precipitator positioned to receive the gases from said passage.

In witness whereof, I have hereunto signed my name.

JOHN H. LAWRENCE. 

